<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form">
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
            type="password"
          ></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      loginFormRules: {
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm () {
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        if (valid === true) {
          // console.log('success submit!')
          // await有两个作用, 一是作为求值关键字, 二是将异步操作变成同步操作;如果方法中使用了await,那么在方法前面必须加上async”
          const { data: res } = await this.$http.post('login', this.loginForm)
          if (res.meta.status !== 200) return this.$message.error('登录失败')
          this.$message.success('登录成功')
          window.sessionStorage.setItem('token', res.data.token)
          // 先存储token再触发路由
          this.$router.push('/home')
        } else {
          console.log('error submit!!')
          return false
        }
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
div.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  // 居中对齐
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
  .btns {
    // 居中对齐
    display: flex;
    justify-content: flex-end;
  }
  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 10px;
    // 告诉浏览器去理解你设置的边框和内边距的值是包含在width内的
    box-sizing: border-box;
    -moz-box-sizing:border-box; /* Firefox */
    -webkit-box-sizing:border-box; /* Safari */
  }
}
</style>
